Intel BLKD945GPMLKR Product Specification - Page 47
Technical Reference
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2 Technical Reference What This Chapter Contains 2.1 Memory Resources ...47 2.2 DMA Channels ...49 2.3 Fixed I/O Map...50 2.4 PCI Configuration Space Map 51 2.5 Interrupts ...52 2.6 PCI Conventional Interrupt Routing Map 53 2.7 Connectors...54 2.8 Jumper Block ...64 2.9 Mechanical Considerations 65 2.10 Electrical Considerations 68 2.11 Thermal Considerations 70 2.12 Reliability...72 2.13 Environmental ...73 2.14 Regulatory Compliance 74 2.1 Memory Resources 2.1.1 Addressable Memory The board utilizes 4 GB of addressable system memory. Typically the address space that is allocated for PCI Conventional bus add-in cards, PCI Express configuration space, BIOS (SPI Flash), and chipset overhead resides above the top of DRAM (total system memory). On a system that has 4 GB of system memory installed, it is not possible to use all of the installed memory due to system address space being allocated for other system critical functions. These functions include the following: • BIOS/ SPI Flash (2 MB) • Local APIC (19 MB) • Digital Media Interface (40 MB) • Front side bus interrupts (17 MB) • PCI Express configuration space (256 MB) • MCH base address registers, internal graphics ranges, PCI Express ports (up to 512 MB) • Memory-mapped I/O that is dynamically allocated for PCI Conventional and PCI Express add- in cards 47